Control for hydraulic motors



March 28, 1950 o. E. ROSEN CONTROL F OR HYDRAULIC MOTORS 2 Sheets-Sheet1 Filed Oct. 16, 1944 INVENTOR. @120 5 6 "March 28, 1950 o. E. ROSEN2,502,234

CONTROL so HYDRAULIC MOTORS' Filed Oct. 16, 1944 2 SheetS-Sheet 2liilllli INVENTOR.

Patented Mar. 28, 1950 CONTROL FOR HYDRAULIC MOTORS Oscar E. Rosen,Detroit, Mich., assignor to The Lodge and Shipley Company, Cincinnati,Ohio,

a. corporation of Ohio Application October 16, 1944, Serial No. 558,825

2 Claims. (Cl. 192.07)

V ,The present invention relates to controls for hydraulic motors andspecifically to means for preventing the overrun of devices being driventhereby.

In the use of hydraulic motors for the drive ,of many devices such asmachine tools, duplicating and die sinking machines and the like, it isoften desirable and sometimes necessary have the driven machine come torest instantaneously, as soon as the supply of power to the motor isshut off. However, because of the inertia of the rotor of the motor, itfrequently happens that the latter continues for a fraction of arevolution so that the driven machine continues to move beyond the pointat which the operator intended it to stop.

Among the objects of the present invention is to overcome thisdifficulty and prevent any effect on the driven machine by any overrunof the motor.

Another object is means to disconnect the motor instantaneously from thedriven device or machine as soon as the supply of motive fluid to themotor is discontinued.

Another object is a fluid actuated clutch, between the motor and drivendevice, actuated to connect or disconnect the two by the presence orabsence of pressure in the motor supply line.

I Other objects and advantages will be apparent to those skilled in theart upon reference to the following description and the accompanyingdrawings in which:

' section.

Figure 5 is asection on line 5-5 of Figure 4.

In the drawings, there is shown at ID a reversible rotary hydraulicmotor which may be of any suitable construction but is preferably of thetype shown in my copending application Serial No.424,'732, filedDecember 29, 1941, now Patent No. 2,393,2 3, on Hydraulic motors, thisbeing a movable vane type motor.

The rotor of such motor is indicated at IDA between two chests [DB andIDC, the latter acting alternately as supply and exhaust of fluid inoperating the motor. The fluid supply line is shownat I I as connectedto a suitable pump, in 'dicated conventionally at I2, drawing fluidthrough conduit. I3 from a suitable source of supply (not shown).

The conduit I I is divided into two branches I IA and I IB, the formerleading to a valve mechanism, indicated conventionally at I5, from whichI 2 lead three conduits I6, I! and ID, the latter bein an exhaustconduit leading back to the source of supply.

By means of the valve mechanism I5, one of the conduits It and I I maybe opened to the pressure fluid from conduit I IA and at the same timethe other of the two is connected to conduit I8. As this is done, fluidunder pressure passes, for example, into chest IDB, through rotor IDAinto chest IfiC and out through conduit I! to conduit I8. This willproducerotation of the rotor in one direction. A reversalof flow throughconduit I'I, chest IDC, the rotor IDA, chest IDB, conduit I5 and conduitI8wi1l produce rotation of the rotor IDA in the reverse direction.

As shown in Figure 1', the motor ID has secured thereto at one end agear reduction unit 20 and at the other end a pressure cylinder 40 whichwill be described later.

The gear reduction 20 consists of a housing fixed to the motor ID bybolting to a flange 2I and containing a suitable idler gear clusterconsisting of a large gear 22 and a small one 23 fixed to the same shaft24. The gear 22 is in constant mesh with the small gear 25 carried by orforming a part of shaft 26 which extends from the housing 2D into andthrough the motor being mounted in bearings 26A and 26B in the twochests IDC and IDB, respectively, and splined to the rotor IDA asindicated at 21. The shaft 26 is mounted in a suitable antifrictionbearing 28 where it emerges from the housing 20 and at its other endpasses through suitable packings 29.

Extending into housing 20 in axial alignment with shaft 28is a shorthollow shaft 34, provided near its inner end with a flange 35, servingto maintain the shaft against outward movement when the parts areassembled, and also provided with a through slot 36 through which passesa key 3| movable longitudinally of the slot.

, As is shown, the end 26A of shaft 26 extends into the opening in shaft34, a suitable bearing 31 being provided therein, and is cross slotted'as at 38 to receive the key 3| when the latter is moved toward theright (Fig. 1).

This key 3| is carried on a rod 30 which extends lengthwise throughshaft 26 and into the cylinder 4D. The key 3| is preferably secured tothe end of rod 30 by nut 3DA which also fixes in a short pilot element303.

Loosely mounted on shaft 34 is a gear 33 in constant mesh relation withgear 23 and provided with a circular recess 32 adapted to receive theends of key 3| when the latter is moved to the right (Fig. 1 I And flxedto the face of gear 33 over the recess is a disc 4| provided with radialslots 42 into which the key 3! may move from the recess 32.

From the foregoing, it will be seen that the motor drive is throughshaft 26, gear 25, gear into the recess 32, the gear 33 and disc fll mayrotate free of the shaft 34.

Shaft 34, incidentally, may be, and preferably is, used as a means towhichthe driven device is coupled by suitable mean not shown.

At the other side of the motor-m is fixedthe means for automaticoperation of the key 3!. This consists of a cylinder 40 (see Fig. 2)containing a piston 45 connectedtorod Ell-and biased toward the outerend of the cylindei by astrong spring 46, the outward movement beinglimited by the adjustable top.

This piston '45 consists of an'outer cylindrical shell open at both endsbut provided with a flange 45A, and an axial plug member 48 whichis heldwithin the'shell in any suitable fashion and 6 serves to hold asuitableantifriction bearing 49 between its inner end and the flange 45A.

In the bearing'49 is mounted an axially bored plug member 50, the rod 30extending therethrough and fixed against'outward relative movement bmeans of suitable nuts 5l, so that the spring 46 tends at all times tomove the rod 38, and therewith thekey 3|, into the recess 32 in gear33and out of the slots 42 in disc 4!.

The rod to is resiliently'held against move 0 ment inward of the piston45 by means of the s ring 55 acting between a stop'member 55 and theouter end of plug 50. The piston, therefore, may move to compress spring46 although movement of the rod may be opposed by the failure of key 31to go immediately into a slot 42.

It ill be clear from the foregoing that as the fl id from pump I2 isforced under pressure into either side of the motor I0. it will, at thesame time. be fo ced into the cylinder All and move is discontinued. thespringimmediately causes 45 the opposite movement of the parts andtherefore, clutch disengagement.

In Fi ure 4 is shown a modified-form of the device, in which the entiremotor shaft is moved to engage and disengage the clutch. In this fig- 50ure the motor in may be identical with that' shown in Figure 1 in whichthe splines 2'1 fixing the rotor andshaft are quite short. Likewise thefiuidsupply conduits are identical the pump I2 -sumjlying fluid underpressure to'conduit HB and to cheer the other of'conduit-s l6 and I1while the fluid outflow from the motoris through conduit l8. Likewisefluid in conduit I I3 flows into the clutch actuating cylinder 400.However,

in this form of the device, the piston 450 is carried on the end ofmotor shaft 260, with the in-' tel-position of a thrust bearing 490, andwhen I pressure is applied, moves'the shaft 260 toward the left (Figure4) to move the "splines 210 into *engagement with matingsplines 210Acarried by 05 the motor rotor MA.

This figure illustrates a motor directly coupled with a driven devicehaving "'an'extending hollow shaft 340, internallyfsplined as at 34!,to'coact with the splind en zs'uA'er the "m'otor'sh aft, the m latterbeing'alsdhoIlowand "acting as a guide and container for a spring 460.This spring 480 resists the action of piston 450 and moves the shaft todisengage the splines 210 when the pressure in the cylinder 400 isrelieved. The conduits and BI serve to drain off any fluid leaking pastthe working parts of the motor and pressure cylinder respectively.

Now having described the invention and the preferred embodiment thereof,it is to be understood that the invention is to be limited, not to thespecific details herein set forth, but only by the scope of the claimswhich follow.

I claimf 1. A hydraulic motor of the rotary type having a casing andhaving its drive shaft extending from both sides of said casing, a gearreduction unit at one side offsaid casing a-n'dconnected to one end ofsaid shaft, a'power output'shaft extending from said unit inaligninentwith said :drive shaft, said output shaft being slotted to receive a keymovable longitudinally'thereof, a driven gear in said unit and providedwith radial slots into which said key may be moved whereby to connectsaid gear and output shaft in driving relation. a cylinder mounted inthe other side of said casing and having therein apiston, meansextending axially of'said drive shaft and connecting said piston to saidkey, spring means for moving said piston in a direction to move saidkeyfrom said radial slots, means for supplying pressure fluid to saidmotor and means for simultaneously supplying pressure-fluid to saidcylinder whereby to move said piston and key to cause the latter toengage said radial slots.

2. A hydraulic motor of the rotary type having acasing and having itsdrive shaft extending from both sides of said casing, a power outputshaft on one side of saidcasing in alignment with said drive shaft, saidoutput shaft being slotted to receive a key movable longitudinallythereof, a disc coaxial with said drive shaft, a driving connectionbetween said drive shaft and said disc, said disc being provided withradial slots into which said key can be moved to connect said disc andsaid output shaft in driving relation, a rod extending axially of andthrough said drive shaft and connected to said key, spring means adaptedto urge said key out of said radial slots, a cylinder mounted in theother side of said casing and having therein a piston connected to saidrod, means for supplying pressure fiuid to said motor, and means forsimultaneously supplying pressure fluid to said cylinder, whereby tomove said piston and key to cause the latter to engage said radialslots.

OSCAR E. ROSEN.

REFERENCES CITED The following references'are of record in the file ofthis patent:

UNITED STATES PATENTS 1 Number Name Date' 1,102,410 Jacoby July 7, 19141,154,149 Weston Sept. 21, 1915 2,081,760 Nardone May 25, 1937 FOREIGNPATENTS Number I Country Date 420,102 Great Britain Nov. 26, 1934387,399- Great Britain ;;;-Feh. 9, 1933

